A flavor-safe composite explanation of $R_K$

TL;DR

This paper proposes a composite Higgs model with flavor-safe features that explains the $R_K$ anomaly by introducing a specific lepton sector embedding, which also impacts Higgs mass considerations.

Contribution

It introduces a novel composite Higgs model with a unique lepton sector embedding that explains the $R_K$ anomaly and reduces the need for ultra-light top partners.

Findings

Explains $R_K$ anomaly within composite Higgs framework.

Violates lepton-flavor universality in neutral currents.

Reduces the necessity for ultra-light top partners.

Abstract

In these proceedings we discuss a flavor-safe explanation of the anomaly found in $R_K= {\cal B}(B \to K \mu^+ \mu^-)/{\cal B}(B \to K e^+ e^-)$ by LHCb, within the framework of composite Higgs models. We present a model featuring a non-negligible degree of compositeness for all three generations of right-handed leptons, which leads to a violation of lepton-flavor universality in neutral current interactions while other constraints from quark- and lepton-flavor physics are met. Moreoever, the particular embedding of the lepton sector considered in this setup provides a parametrically enhanded contribution to the Higgs mass that can weak considerably the need for ultra-light top partners.